When a device (rod) is attached by hooks or screws to the spine at each end of the device and to at least one other point of the spine along the device, this is called:

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Segmental instrumentation refers to the method of attaching a device to the spine at multiple points along its length, including both ends and at least one other point along the spine, to provide support and alignment. This contrasts with nonsegmental instrumentation, which involves attachment at only the ends of the device.

When a Device (Rod) Is Attached by Hooks or Screws